nginx rewite base file name help!

[abcomp01]

http://pic.test.com/view.php?filename=947284035_234601603334998.jpg

to 

http://pic.test.com/947284035_234601603334998

base file name 

thanks

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,232243,232243#msg-232243